The Ciarlet triple [1]} for our element is \((\hat{\mathcal {I}},\mathrm {P}_p(\hat{\mathcal {I}}), \lbrace \hat{s}^*_i\rbrace _{i=0}^{p})\) . The point evaluations at the vertices
guarantees \(C^0(\hat{\mathcal {I}})\)  continuity, and hence \(H(\operatorname{grad}, \hat{\mathcal {I}})\) -conformity.
